Segment Reporting - Financial Information of Company's Operation by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 795,111	$ 728,084
Inter-segment revenues	0	0
Operating income (loss)	95,050	101,130
Interest expense	(12,191)	(17,214)
Other income (expense), net	7,582	(24,339)
Income taxes	(15,977)	(13,311)
Net earnings	74,464	46,266
Depreciation and amortization	69,692	64,685
Expenditures for property, plant & equipment	47,565	33,792
Segment assets	6,515,862		$ 6,512,650
Goodwill	1,294,748		1,296,727
Unallocated & Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	0	0
Inter-segment revenues	(94,932)	(74,303)
Operating income (loss)	(11,167)	0
Interest expense	0	0
Other income (expense), net	0	0
Income taxes	0	0
Net earnings	0	0
Depreciation and amortization	0	0
Expenditures for property, plant & equipment	0	0
Segment assets	0
Goodwill	0
Photonic Solutions
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Goodwill	1,052,301		1,053,028
Photonic Solutions | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	536,023	497,727
Inter-segment revenues	16,563	7,216
Operating income (loss)	56,545	50,435
Interest expense	0	0
Other income (expense), net	0	0
Income taxes	0	0
Net earnings	0	0
Depreciation and amortization	42,137	38,687
Expenditures for property, plant & equipment	24,977	21,234
Segment assets	4,242,706
Goodwill	1,052,301
Compound Semiconductors
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Goodwill	242,447		$ 243,699
Compound Semiconductors | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	259,088	230,357
Inter-segment revenues	78,369	67,087
Operating income (loss)	49,671	50,695
Interest expense	0	0
Other income (expense), net	0	0
Income taxes	0	0
Net earnings	0	0
Depreciation and amortization	27,555	25,998
Expenditures for property, plant & equipment	22,589	$ 12,558
Segment assets	2,273,156
Goodwill	$ 242,447